128161249 has 8 divisors (see below), whose sum is σ = 136302048. Its totient is φ = 120087360.

The previous prime is 128161247. The next prime is 128161259. The reversal of 128161249 is 942161821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128161249 - 2¹ = 128161247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128161247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12747 + ... + 20464.

It is an arithmetic number, because the mean of its divisors is an integer number (17037756).

Almost surely, 2^128161249 is an apocalyptic number.

It is an amenable number.

128161249 is a deficient number, since it is larger than the sum of its proper divisors (8140799).

128161249 is a wasteful number, since it uses less digits than its factorization.

128161249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33455.

The product of its digits is 6912, while the sum is 34.

The square root of 128161249 is about 11320.8325223899. The cubic root of 128161249 is about 504.1799572057.

The spelling of 128161249 in words is "one hundred twenty-eight million, one hundred sixty-one thousand, two hundred forty-nine".